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Common tech Abbreviations and Acronyms

Old November 16th, 2007, 6:52 PM
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Default Common tech Abbreviations and Acronyms

Here is a start on untangling these codes. If you run across acronyms or jargon you don't understand, send them in.

AFC - Air Flow Control
ALDL - Assembly Line Diagnostic Link. Former name for GM (only) Data Link Connector, the connector socket into which the scan tool plug is inserted; sometimes used to refer to any pre-OBD II computer signals
ASE- Automotive Service Excellence. To become fully ASE certified, there are 12 areas of expertise a mechanic is tested on.
BCM- Body Control Module (systematic controls lighting(DRL/AHL), climate controls, radio, automatic intermittent wipers, etc)
CAN - Controller Area Network
CARB - California Air Resources Board
CFI - Central Fuel Injection (a.k.a. Throttle Body Fuel Injection TBI)
CFI - Continuous Fuel Injection
CO - Carbon Monoxide
CPS-crank position sensor
DLC - Data Link Connector
Driving Cycle - A specific sequence of start-up, warm-up and driving tasks that tests all OBD II functions (Details)
DTC - Diagnostic Trouble Code
ECM - Engine Control Module- usually the main in-car computer controlling emissions and engine operation
ECT - Engine Coolant Temperature
ECU- Engine Control Unit- same as ECM, but usually called ECU in imports.
EEC - Electronic Engine Control
EEPROM or E2PROM - Electrically Erasable Programmable Read Only Memory
EFI - Electronic Fuel Injection
EGR - Exhaust Gas Recirculation
EMR - Electronic Module Retard
EPA - Environmental Protection Agency. Federal agency. Office of Mobile Sources is the branch concerned with auto emissions.
ESC - Electronic Spark Control
EST - Electronic Spark Timing
DPFE - Differential Pressure Feedback EGR sensor ( On Ford OBDII systems).
DTC - Diagnostic Trouble Code
FLI - Fuel Level Indicator
Fuel Trim - Engine computer function that keeps the air/fuel mixture as close to the ideal 14.7:1 stoichiometric ratio as possible
HC - Hydrocarbons
HEI - High Energy Ignition
HO2S - Heated Oxygen Sensor
IAC- Idle Air Control
IAT - Intake Air Temperature
ICM- Ignition control module
ISO 9141 - International Standards Organization OBDII communication mode, used by Chrysler and most foreign cars. One of three hardware layers defined by OBD II
J1850PWM - (Pulse Width Modulated) SAE-established OBD II communication standard used by Ford domestic cars and light trucks. One of three hardware layers defined by OBD II
J1850VPW - (Variable Pulse Width Modulated) SAE-established OBD II communication standard used by GM cars and light trucks. One of three hardware layers defined by OBD II
J1962 - SAE-established standard for the connector plug layout used for all OBD II scan tools
J1978 - SAE-established standard for OBD II scan tools
J1979 - SAE-established standard for diagnostic test modes
J2012 - SAE-established standard accepted by EPA as the standard test report language for emission tests
MAF - Mass Air Flow
MAP - Manifold Absolute Pressure
MAT - Manifold Air Temperature
MFG - Manufacturer
MIL - Malfunction Indicator Light. The "Check Engine Light" on your dash.
NOx - Oxides of Nitrogen
O2 - Oxygen
OBD - On-Board Diagnostics
OBDII or OBD II - Updated On-Board Diagnostics standard effective in cars sold in the US after 1-1-96
Parameters - Readings on scan tools representing functions measured by OBD II and proprietary readings
PCM - Powertrain Control Module, the on-board computer that controls engine and drive train
PCV - Positive Crankcase Ventilation
PID - Parameter ID
Proprietary Readings - Parameters shown by on-board computers which are not required by OBD II, but included by manufacturer to assist in trouble-shooting specific vehicles.
PTC - Pending Trouble Code
RPM - Revolutions Per Minute
SAE - Society of Automotive Engineers, professional organization that set the standards that EPA adopted for OBD and OBD II
Scan Tool - Computer based read-out equipment to display OBD II parameters
SES - Service Engine Soon dash light, now referred to as MIL
SFI - Sequential Fuel Injection
Stoichiometric ( Stoy'-kee-o-metric) Ratio - Theoretical perfect combustion ratio of 1 part gas to 14.7 parts air
TBI - Throttle Body Injection
TPI - Tuned Port Injection
TPS - Throttle Position Sensor
TPMS- Tire Pressure Monitoring System
TV- as in Trottle valve
VAC - Vacuum
VCM - Vehicle Control Module, the in-car computer that oversees engine management, transmission operation, anti-lock brakes, and other functions not directly related to emissions control
VIN - Vehicle Identification Number
VSS - Vehicle Speed Sensor
WMS= wheel mounting surface.
WOT - Wide Open Throttle
700R4/4L60- are basically the same thing.
4L60E is an electronically controlled 700R4/4L60.
4x4x4=4wheels x 4driven wheels x 4 doors
4x2x2=4wheels x 2driven wheels x 2 doors
4.3/700R4/207= example of: Engine size/ transmission/ transfer case

Last edited by EvansBlue; March 18th, 2009 at 8:40 PM.
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Old March 18th, 2008, 10:57 AM
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Default RE: Common tech Abbreviations and Acronyms

MPFI stands for multi port fuel injection
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Old April 7th, 2009, 7:44 AM
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Well this is very important in student life or in professional life that learn lot of abbreviation for writing short forms for understanding.
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Old September 8th, 2009, 8:55 PM
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CKP- Crank position sensor
CMP- Cam position sensor
EBCM- Electronic brake control module
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Old March 15th, 2010, 5:18 PM
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Wow,,,,,,,,,, Great collection of Chevrolet Car`s, but if there is pic present with model name then its might me too great for visitor ...

Last edited by unicorn; August 12th, 2011 at 4:58 AM.
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Old August 14th, 2010, 3:41 AM
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Originally Posted by unicorn View Post
Wow,,,,,,,,,, Great collection of Chevrolet Car`s, but if there is pic present with model name then its might me too great for visitor ...
Interesting suggestion.
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Old February 21st, 2011, 12:26 AM
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Thank you very much. This is great info for the Abbreviations and Acronyms.

Arctic Cat Atvs | Chevrolet Trucks For Sale
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Old March 10th, 2011, 11:58 AM
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I am a mechanical engineering student.Hope that your list will be very helpful to me.
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Old April 15th, 2011, 1:29 PM
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sorry if im doing this wrong but just purchased a 2007 Silv. LTZ. The dealer told me it is normal to hear a ejecting noise or spining noise from the Navigatin DVD if it is in. Could someone please tell me if this is true and if so is there a way to get it to stop..thanks for any help
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Old April 18th, 2011, 2:26 PM
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roblcopeland99, I would like to escalate this question to our Techincal Assistance team. What I need to do is is for you to direct message me your name and VIN. Hopefully I will get an answer back for you.

Jeff Morris, Chevrolet Customer Service
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